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Old 11-10-2009, 01:26 PM   #1
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Onan spark arrestor

I have a question about the spark arrestor on my Marquis Gold 7000 - gas generator. My genset has about 150 hours on it and I have never cleaned out this spark arrestor.
Has any one else done this - how necessary is it? I would have a bit of a concern with the 7/16 plug being stuck since I have never had it off. It does appear to have a small bit of rust around it.

My generator is running fine - but I thought I should do the maintenance on this plug arrestor since the Onan schedule calls for it to be done every 50 hours.

Comments? Suggestions?
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Old 11-10-2009, 08:15 PM   #2
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My guess is that most motorhome owners have never done it nor had it done. IT is on the Onan maintenance schedule, though. I know I haven't. I heard of one case where apparently a dirty spark arrester caused the genset to run poorly.
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Old 11-10-2009, 08:40 PM   #3
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I have cleaned mine 3 times in the past 6 years ...just under 1,000 hrs on the generator at this point. I believe the schedule on my generator (7500 diesel) calls for it every 150 hrs/annually. It takes a number of extensions on my socket driver to reach it on mine ...20+ inches as I recall. At least once there was a surprising amount of carbon there when I got the plug out.
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Old 11-10-2009, 08:44 PM   #4
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I did mine at about 250HR'S because of the Performance Schedule. The plug came out no problem. I got a little rust and carbon that blew out and didn't notice any performance differance. I don't know if I'll do it again unless I really want to do something to the coach.
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Old 11-10-2009, 11:41 PM   #5
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Onan maintenance schedule says to do it - so I do. Their expertise on the proper preventative maintenance is much greater than mine, so I try to follow their recommendations. Have had 5 MHs with Onans and have used them all a great deal - probably average 200 hours per year at minimum, and have never had a problem. Works for me.
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Old 11-11-2009, 12:22 AM   #6
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J Griff, Is the Onan in the back of the wagon or in the TT?

Mike
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Old 11-11-2009, 06:31 PM   #7
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Thanks for the replies. I may give it a try. Mine is not hard to get at, except that it requires an 8-point socket 7/16 and they are not easy to find.
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Old 11-12-2009, 12:15 PM   #8
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I found my 8point at Sears.
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Old 11-12-2009, 12:18 PM   #9
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Thanks, Rocky. I will have a look there.
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Old 11-13-2009, 03:11 PM   #10
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mfire1339
Thanks for noticing - that was our first RV, three years of use between overseas assignments. The 57 chevy wagon went to Japan and in the 3 years there never got over 35 mph, more often 15-20. Brought it home and threw a rod first day of travel.
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